Refreshing a standard .net 2.0 grid / XMLsource

Question

I have a Standard .net 2.0 data grid which uses a XMLDatasource. The datasource is set dynamically by passing in XML string to the "Data" property of the XMLdatasource on a button click event.

This workd fine the first time around but not on subsequent button clicks.

i.e. eventhough the xml passed in changes the grid only diplays the initial output.

Is there something i need to do in order to make sure the grid refreshes to show the correct values??

current code

aspx grid code

<asp:GridView ID="GridView1" 
          Runat="server" 
          DataSourceID="XmlDataSource5" 
          AutoGenerateColumns="False" AllowPaging="True"
          style="width:100%; height:100%;" 
          AutoGenerateSelectButton="True" 
          EnableViewState="False">
    <SelectedRowStyle BackColor="Red" />
    <Columns>
       <asp:BoundField DataField="TYPE" HeaderText="TYPE" SortExpression="TYPE" />
       <asp:BoundField DataField="DESCRIPTION" HeaderText="DESCRIPTION" SortExpression="DESCRIPTION" />
    </Columns>
</asp:GridView>

vb.net code

Private Sub btnTest_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnTest.Click

    XmlDataSource5.Data = _testLib.GetGridXML(_Num)
    GridView1.DataBind()
End Sub

where _testLib.GetGridXML is a function that returns an XML string based on the _Num passed in.

Answer 1

You need to call DataBind on the grid to re-bind it to the updated values in the datasource

Answer 2

The problem was to do with the setup of the datasource itself and not the Gridview!

In order to make it refresh i needed to set the "EnableCaching" property in the XMLDatasource to "False" (it is set to "True" as default).

The grid now refreshes fine even without calling the Gridview.DataBind method.

Thanks for your time and help Macros!